1. A. A. Andronov, V. A. Kozlov, L. S. Mazov andV. N. Shastin,Pis'ma v ZhETF 30 (1979) 585.
2. A. A. Andronov, I. V. Zverev, V. A. Kozlov, Yu. A. Nozdrin, S. A. Pavlov andV. N. Shastin,Pis'ma v ZhETF 40 (1984) 69.
3. S. Komiyama andS. Kuroda,Appl. Phys. Lett. 47 (1985) 958.
4. A. A. Andronov (Ed), Submillimeter Semiconductor Hot-Hole Lasers, Collection of Articles (in Russian), (Gorky, 1986).
5. V. N. Murzin andA. P. Chebotarev,Sov. Phys. ? Lebedev Inst. Reports, No 5 (1986) 17.